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"I think he says: 'I've worked 25 years or more to build the business up, why am I going to give half to that whore?'," he said.

The court also heard Foster was the one who contacted police about Mr Chardon, who was in custody on other matters, after he saw a TV broadcast about a search for Novy's body.

He claimed after telling Mr Chardon about the segment, the accused killer said, "well they won't find her there", before he got his lunch and called his lawyer.

Foster agreed to become a police informant and moved into Mr Chardon's cell for six weeks.

The court heard as part of the conditions of the deal he asked investigators for a listening device because he didn't think anyone would believe his account.

Foster claimed after living with Mr Chardon for just a few days he was "1000 percent convinced" he had killed his wife.

Novy Chardon was allegedly murdered. ()

"I think he's a very troubled man and I believe he murdered his second wife," he said.

"I would wager that he killed his first wife but I have no evidence on that."

Foster, who is on remand in a NSW jail, repeatedly denied there had been anything in it for him in exchange for his help.

He claimed instead he was trying to do the right thing for a change and that someone needed to speak up for Novy.

But he conceded he asked himself as recently as this morning if he was risking his life by giving evidence.

"The reason I say that ... is the Queensland police came to me two years ago and said they had intel Mr Chardon's daughter was trying to get a hit man to kill me and did I want witness protection?" he claimed.

Missing woman Novy Chardon, 34, who was last seen on Wednesday, February 6. (AAP)

Foster said whenever he had questioned his involvement in the case he thought about what his idol, rugby league coach Wayne Bennett, would do.

"Coach Bennett would say 'you tell the truth and you do your civic duty' and that's why I'm here," he said.

Novy, who was 34, was last seen at the pair's northern Gold Coast home on February 6, 2013.

Her car was found at Nerang train station a few days later, but despite extensive searches and a $250,000 reward, her body has never been found.